Well I do use them to "time" purchases through Amazon, not look at other retailers to make my purchase location decision.
I have alerts setup there to alert me when the price gets to $x, 1 of the few places I have setup like that. So in my case, I definitely buy more from Amazon because of the site.
Amazon must think so it's allowed camelcamelcamel to live on for 8+ years I've been using it.
But if they think so why do they have this clause that won't allow CCC competitors?